Motivation vs Discipline
The motivational component is like a wave that crests and troughs. If you want to keep improving, you need to get up and down and continue to climb it. This is where discipline comes in. If you want to climb a mountain, you need to get up from the ground and walk up a steep ladder. If you want to succeed, you need both, and you can train yourself to be motivated and self-disciplined at the same time.